We're releasing 0.6.3 to fix two important issues (a serious potential denial-of-service attack, and to improve new-block propagation times for blocks containing lots of transactions).

If you can, please help do some sanity testing-- shutdown bitcoin, then download, install, and run 0.6.3 and let us know "works nicely for me running on 64-bit Ubuntu 10.04" by posting a quick reply to this thread.

after download when i started the file i got a similar message, and it wanted to sandbox the installer. i would bet the install would fail in a sandbox. i think its time to get a new virus scanner..

That's actually very sensible way for the scanner to operate. Afterall, this file _is_ brand new. Of course, in this case, you already knew it, so the warnings were just in the way. I'd expect in most cases that would be quite useful in shielding your system from new unknown threats.

Before you copy the blk* files, you must run with the -detachdb option and make sure you shutdown bitcoin and wait for it to exit completely. With 0.6.2, we change the default from "take a long time to shut down, but leave standalone .dat files" to "shutdown quickly, but leave .dat files that are tied to the database/log.* files".

Too many ordinary users were quitting bitcoin and then immediately powering off their systems, leaving the database in a bad state.

How often do you get the chance to work on a potentially world-changing project?

Before you copy the blk* files, you must run with the -detachdb option and make sure you shutdown bitcoin and wait for it to exit completely. With 0.6.2, we change the default from "take a long time to shut down, but leave standalone .dat files" to "shutdown quickly, but leave .dat files that are tied to the database/log.* files".

Too many ordinary users were quitting bitcoin and then immediately powering off their systems, leaving the database in a bad state.

Thanks for the info Gavin,

I followed these steps and now 0.6.3 is running fine on 64-bit Xubuntu 11.04.

Note 1: While waiting the 10 minutes or so to shutdown using the -detachdb option the GUI looks like it's not responding.Note 2: Before I copied the blk* files, I needed ~1350 blocks to synchronize with the network but when I restarted 0.6.3 the count was only ~1050 blocks. After a couple of minutes, the count increased to ~1225. Note 3: I was only able to connect to 8 nodes on 0.6.3 even though the bitcoin.conf hasn't changed and I normally connect to +100 nodes.